# AVR128DB28-I

**Microchip Tech** · Pre-ordered MCUs · SSOP-28-208mil

AVR128DB28-I from Microchip Tech, in a SSOP-28-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | PA7 | bidirectional | General purpose I/O pin on PORTA; also CLKOUT, TCA0 OUT and an alternate EVOUTA position. |
| 2 | PC0 | bidirectional | General purpose I/O pin on PORTC, which is on the MVIO VDDIO2 domain; also USART1 TxD, SPI1 MOSI (alternate) and LUT1 IN0. |
| 3 | PC1 | bidirectional | General purpose I/O pin on PORTC, which is on the MVIO VDDIO2 domain; also USART1 RxD, SPI1 MISO and LUT1 IN1. |
| 4 | PC2 | bidirectional | General purpose I/O pin on PORTC, which is on the MVIO VDDIO2 domain; also TWI Fm+ SDA (master), USART1 XCK, SPI1 SCK, EVOUTC and LUT1 IN2. |
| 5 | PC3 | bidirectional | General purpose I/O pin on PORTC, which is on the MVIO VDDIO2 domain; also TWI Fm+ SCL (master), USART1 XDIR, SPI1 SS and LUT1 OUT. |
| 6 | VDDIO2 | power_in | Supply for the MVIO port C pins; must be connected to VDD in single-supply mode. |
| 7 | PD1 | bidirectional | General purpose I/O pin on PORTD; also analog input AIN1, OP0 INP, ZCIN and LUT2 IN1. |
| 8 | PD2 | bidirectional | General purpose I/O pin on PORTD; also analog input AIN2, OP0 OUT, EVOUTD and LUT2 IN2. |
| 9 | PD3 | bidirectional | General purpose I/O pin on PORTD; also analog input AIN3, OP0 INN and LUT2 OUT. |
| 10 | PD4 | bidirectional | General purpose I/O pin on PORTD; also analog input AIN4 and OP1 INP. |
| 11 | PD5 | bidirectional | General purpose I/O pin on PORTD; also analog input AIN5 and OP1 OUT. |
| 12 | PD6 | bidirectional | General purpose I/O pin on PORTD; also analog input AIN6, OPAMP OUT and LUT2 OUT (alternate). |
| 13 | PD7 | bidirectional | General purpose I/O pin on PORTD; also VREFA external voltage reference, analog input AIN7, OP1 INN and EVOUTD (alternate). |
| 14 | AVDD | power_in | Analog supply pin; internally connected to VDD on the AVR DB family. |
| 15 | AGND | power_in | Analog ground pin. |
| 16 | PF0 | bidirectional | General purpose I/O pin on PORTF; also XTAL32K1 32.768 kHz crystal connection, analog input AIN16, USART2 TxD and LUT3 IN0. |
| 17 | PF1 | bidirectional | General purpose I/O pin on PORTF; also XTAL32K2 32.768 kHz crystal connection, analog input AIN17, USART2 RxD and LUT3 IN1. |
| 18 | PF6 | input | Input-only pin on PORTF; also the external RESET pin when RSTPINCFG enables external reset with pull-up on PF6. |
| 19 | UPDI | input | Unified Program and Debug Interface pin, a digital input used for programming and debugging. |
| 20 | VDD | power_in | Main supply pin; the device operates from 1.8 to 5.5 V. |
| 21 | GND | power_in | Ground pin for the digital supply. |
| 22 | PA0 | bidirectional | General purpose I/O pin on PORTA; also XTALHF1 high-frequency crystal connection, EXTCLK and USART0 TxD (alternate). |
| 23 | PA1 | bidirectional | General purpose I/O pin on PORTA; also XTALHF2 high-frequency crystal connection and USART0 RxD. |
| 24 | PA2 | bidirectional | General purpose I/O pin on PORTA; also TWI Fm+ SDA (master), USART0 XCK, TCA0 WO2, EVOUTA and LUT0 IN2. |
| 25 | PA3 | bidirectional | General purpose I/O pin on PORTA; also TWI Fm+ SCL (master), USART0 XDIR, TCA0 WO3 and LUT0 OUT. |
| 26 | PA4 | bidirectional | General purpose I/O pin on PORTA; also USART0 TxD (alternate), SPI0 MOSI, TCA0 WO4 and WOA. |
| 27 | PA5 | bidirectional | General purpose I/O pin on PORTA; also USART0 RxD (alternate), SPI0 MISO, TCA0 WO5 and WOB. |
| 28 | PA6 | bidirectional | General purpose I/O pin on PORTA; also USART0 XCK (alternate), SPI0 SCK, WOC and LUT0 OUT (alternate). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SSOP-28-208mil |
| Category | Embedded Processors & Controllers |
| Pins | 28 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage |  | 1.8 |  | 5.5 | V | Ordering table, AVR128DB28-I/SS (28-pin SSOP, -40°C to +85°C) | 628 |
| Temperature Range |  | -40 |  | 85 | °C | Ordering table, AVR128DB28-I/SS (-I grade) | 628 |

## CAD (KiCad official)

- Symbol: `AVR128DB28-I`
- Footprint: `Package_SO:SSOP-28_5.3x10.2mm_P0.65mm`
- 3D model: SSOP-28-208mil (KiCad packages3D, STEP)
- 3D model files: `avr128db28-i-etched.step` / `avr128db28-i-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `avr128db28-i.step` / `avr128db28-i.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Microchip Tech datasheet](docs/avr128db28-i-datasheet.pdf) (660 pp, sha256 `1fb225fb44c6b2af`, retrieved 2026-11-02, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/avr128db28-i-datasheet.pdf)